Measured-service telephone system.



G. A. YANOCHOWSKI.

MEASURED SERVICE TELEPHONE SYSTEM.

APPLlCATiON FILED FEB. 4, 1914. RENEWED APR. 30. 1911.

Patented May 7, 1918.

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MEASURED SERVlCE TELEPHONE SYSTEM. APPLICATION FILED FEB .4. 1914.RENEWED APR. 30. 1917.

1,265,716. Patented May 7,1918.

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MEASURED SERVICE TELEPHONE SYSTEM.

APPLICATION FILED FEB. 4. 1914. RENEWED APR- 30. 1911.

1 65,? 1 6. Patented May 7, 1918.

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GEORGE A. YANOGHOWSKI, OF CHICAGO, ILLINOIS, ASSIGNOR TO AUTOMATICELECTRIC COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

MEASURED-SERVICE TELEPHONE SYSTEM.

mosaic.

Specification of Letters Patent.

Patented May 7,1918.

Application filed February 4, 1914, Serial No. 816,404. Renewed April30, 1917. Serial No. 165,609.

To all whom it may concern:

Be it known that I, GEORGE A. YANocnowsnr, a citizen of the UnitedStates of America, and resident of Chicago, Cook county, Illinois, haveinvented certain new and useful Improvements in Measured-ServiceTelephone Systems, of which the followin is a specification.

ll 1y invention relates to measured service telephone systems and hasfor its object the provision of a systemin which a call can be chargedto either the calling or the called subscriber.

My invention is in the nature of an improvement on the system disclosedin the application of Albert Andersen for improvement in measuredservice telephone systems, Serial No. 804,902, filed December 5, 1913.

The object of my present invention is to provide improved means foroperating the meters on either the calling or the called line, whichmeans are controlled by an increased fiow of current instead of by a reversed flow of current, as in the Andersen invention. Furthermore, myimproved means are operated over the trunk-release conductor, and inthis manner I avoid the necessity of providing any eXtra wipers on theswitch for the purpose of controlling the operation of the measuredservice device.

A further feature of my invention is the provision of a simplified cordcircuit for use in semi-automatic systems.

These and other objects of my invention will be more clearly understoodby reference to the accompanying drawings, in which I have illustratedmy invention in connection with a semi-automatic telephone systememploying switches of well-known types.

Figures 1, 2 and 3 taken together show a complete circuit connectionbetween a calling substation A and a called substation A in a systemembodying the principles of my invention. 7

Fig. 4: discloses a selector switch of the type for use between the lineswitch C and the connector switch H in a system so large as to requirethe use of such selector switch. This selector switch is disclosed inthe prior art and its operation is fully degether with its individualmeter M. The line switch 0 belongs to a group of similar line switchesthe plungers (not shown) of which engage a shaft and are controlled bythe operation of the master switch D in such a manner that they are,when in normal position, held directly in front of an idle trunk lineleading through a group of relays F to the answering jack J. At Q thereis shown an operators cord circuit to which 1s added a calling device Lwhich is herein represented by a pair of impulse springs.

In Fig. 2 there is shown a line switch C adapted to be seized by thebefore-mentioned cord circuit to extend a connection to the connectorswitch H.

Fig. 3 represents the called line switch C, together with its individualmeter M and the called substation A.

The subscribers substation A is of any suitable or approved type andcomprises the usual receiver 2, transmitter 3, switch hook 4, ringer 5and condenser 6. Being an automatic substation it is also provided withan impulse transmitter or calling device which is represented herein bya pair of impulse springs 7 and 8 and an impulse wheel 9, which latteris assumed to be controlled through the medium of a finger hole dial(not shown) in such a manner that the impulse springs 7 and 8 may bemomentarily separated a number of times corresponding to the digitcalled.

The subscribers individual switch C is of the general type ofsubscribers line switch shown in British patent to R. W. James No.26,301 of 1906, being, however, of the particular type disclosed inBritish patent to T. G. Martin N0. 1419 of 1910. This line switchcomprises among other details a plunger (not shown) attached to the endof a so-called plunger arm 10 which iscontrolled by the magnet 11. Themagnet 11 comprises four windings, namely, a pull-down winding 12, acut-off or holding winding 13, a line winding 14 and an auxiliarywinding 15. The core of the magnet 11 is so constructed that themagnetic circuit of the windings l2 and 13 is separate from that of thewindings 14: and 15. The winding 12 operates both the plunger arm 10 andthe cut-off armature 16, while the winding 13 is only strong enough tooperate the cut-ofi armature 16 and to hold the plun er arm 10 in itsoperated position. When the plunger (1724) is shown,

forming the terminal of a trunk line leading to a group of relays F,which relays are in turn connected directly with the answering jack J.Each trunk line is connected in multiple with the corresponding springsof all the line switches of the group which is controlled by the masterswitch D. The switch G is controlled bythe subscriber through the mediumof the line relay 14,

as will be hereinafter more fully explained.

Associated with theline switch C is a registering meter M which isoperated by a doublewvound slow acting magnet 50. The windings of themagnet 50 are so proportioned that it requires the energization ofcurrent fed to both windings in the same direction to attract thearmature, said armature being unaffected by the *energization of eitherwinding alone, or by the energization of the two windings in oppositionto each other. I preferably make the magnet 50 slow acting so that itwill not respond to alternating current when the substation is called.

The master switch D is of the same gen- 'eral type as that disclosed inBritish Patent 7 No. 26,801 of 1906, referred to above, being,

however, of the particular type disclosed in said British Patent No.1419 of'1910. The function of the master switch, as is well known, is tomaintain the plungers of all the idle line switches in position toengage the terminals of an idle trunk line.

The device F consistsof a group of re lays, together with the usual linesignal lamp 25. These relays control the battery the calling'subscribers substation. The relay 26 is a marginal relay that is, itdoes not receive suficient current when energized in series with tooperatively energize, but takes the combined strength of the batteries Band B to operatively energize. However, when the said relay is onceenergized itreceives suiiicient current through the relay 27 to remainoperatively energized.

The operators cord circuit 0 is provided with the usual supervisorysignals 29 and 30. The signal 30 is controlled by a polarized relay 31'bridged across the conductors 32 and 33, which bridge includes the key KThe signal 29 is controlled by the relay 27 and the springs 28. Thesprings 28. are plug seat springs-that is, they are normally separatedwhen the cord circuit is not in use.

The cord circuit is also provided with the keys K and K each of whichcontrols means to operate the meters at the calling and calledsubstations in a manner to be the relay 27 meagre hereinafter more fullydescribed. The usual listening key K is also provided, together with thekey K for bridging the calling device L across the cord.

The line switch C (Fig. 2) is similar in all respects to the line switchC.

The connector H is of the same general type of connector switchdisclosed in United States Letters Patent No. 815,17 6, granted March13, 1906, to Keith, Erickson and Erickson, the circuits, however, beingmodified to adapt the switch to operate in a sys tem in which controlledby impulses delivered over the two sides of the line in series. Theconnector is provided with a shaft (not shown) carrying the wipers 34,35 and 36, which shaft is controlled by the vertical magnet 37 and therotary magnet 38. The'usual side switch comprising the wipers 39, 40, 41and 42 is controlled by the private magnet 43 in the usual well-knownmanner; The magnet 44 is the usual release magnet. The line rclay 45 isconnected with the calling line through the reversing springs of thesocalled back-bridge relay 46. The said backbridge relay 46 is connectedwith the called line through the reversing springs of the relay 47. Therelay 47 is a marginal relay that is, it will not operatively energize.when it receives current only over the circult including the highresistance winding 48 of the line switch C and the battery B in series,but when the key K is operated at the cord circuit 0, the said relay 47receives sufiicient current from the battery B over a path ofcomparatively low resistance to operatively energize. andB are adaptedto be connected in series with the winding 4Sthat is, one has itsnegative pole grounded and the other has its positive pole connectcd'toground. The ringing relay 49 is the means through which ringing currentis applied to the called line.

The line switch C, the meter M and the called substation A are similarin all respects to the line switch C, the meter M and the calledsubstation A.

Having given a general description of the apparatus involved in the,system, in order to give a complete understanding of my invention I willnow scriber at substation A. may obtain connection-with the subscriberat the substation A, and how the call maybe charged either to thesubstation A or the substation A.

Upon the removal of the receiver from the switch-hook 4 at thesubstation A, a circuit is closed through the line winding 14 of theindividual switch C, thereby attracting the line armature 51. Thearmature, upon being attracted, closes a circuit through the pull-downcoil 12 in series with l the auxiliary winding 15. The pull-down thecentral oflice apparatus is The batteries B describe how the sub- 1coil, upon energizing, attracts the armature 10 to force the plungerinto the bank of springs 17 to 24, inclusive. It also operates thecut-off armature 16, thereby disconnecting the line winding 14 from theline. The armature 51 does not fall back immediately, however, owing tothe fact that the winding 15 is still in series with the pull-downwinding 12. Upon the armature 10 being drawn down, the springs 52 and 53are brought together to short-circuit the auxiliary winding 15, makingthe same slightly slow acting. The armature 51 being slow to fall backallows sufiicient time for a holding circuit for the cut-off or holdingwinding 13 to be closed in the switch ahead. The engagement of thesprings 17 and 20 with the springs E21 and 24, respectively extends thesubscribers lines to the line relay 54 of the group of relays 1*. Theline relay 54 is thereupon energized and closes the said holdingcircuit. This circuit extends from ground G through the contact ofsprings 55, bank springs 22 and 18 and the said holding winding 18 tothe battery lead 100, thence through battery B to ground. The winding13, upon energizing. holds the armature 16 and the armature 10 in theiroperated positions after the circuit of the pulldown winding is brokenby the falling back of the line armature 51. A guarding ground potentialis supplied to the connector private bank contact of the calling line assoon as the relay'54 is energized. This circuit extends over the abovecircuit to the bank spring 18, thence over the conductor 56 to the saidprivate bank contact. The magnet is now carrying current in both of itswindings but is not operatively energized, as the two windings areenergized in opposition to each other. A further result due to theenergization of the relay 54 is the closure of a circuit through theline signal 25. The said circuit extends from ground G through thecontacts of springs 57, springs 58 and the said line signal to thebattery lead 100, thus causing the said lamp to glow and signal theoperator that a. connection is desired.

The operator immediately inserts the plug P into the jack J, whichoperation causes the springs 59 to close contact and form a new holdingcircuit for the holding winding of the line switch C. This circuitextends from ground G2 through contact of springs 59, springs 22 and 18,holding winding 13 to battery lead 100. A further result due to theinserting of the plug P into the jack J is the closure of a circuitthrough the relays 27 and 60. The said circuit extends from ground Gthrough the relay 27, sleeve of the plug P, bush of the jack J. springs61 and the relays and 26 in multiple to the battery lead 100. The relay27, upon energizing, opens the circuit of the supervisory lamp 29 at thesprings 62. The relay 60, upon energizing, opens the circuit of the linesignal lamp at the springs 58. The relay 26 does not receive sutlicientcurrent over this circuit to operatively energize. The operator answersby throwing the key K to bridge her talking set across the line. Theoperator now takes the calling subscribers order. -VVe will assume thatthe subscriber A is desired, whose number is 20, and that the callingsubscriber Wishes to have the call charged to the substation A. Theoperator then inserts the plug P into the Jack J and operates the key Kto bridge the calling device L across the conductors 64 and 65 leadingto the line switch C The line switch C operates in the same manner asdescribed for the line switch 0 to extend the line connection to an idleconnector H. The line relay 45 of the connector H is immediatelyenergizedf This circuit extends from ground G through the lower windingof said relay, springs 67 of the back-bridge relay 47, bank springs 68and.69, conductor 65, springs 73 of the jack J ring of the plug P, key Kcalling device L, key K tip of the plug P spring 74 of the jack J,conductor 64, bank springs 71 and 70, springs 72 and the upper windingof the relay 45 to battery 13. The relay 45, upon energizing, closes acircuit through the slow acting relay 7 5. This circuit extends fromground G through contacts of springs 83 and 84, winding of relay 75 tobattery lead 100. The relay 75. upon energizing, closes a hold ingcircuit for the holding winding 48 of the line switch C This circuitextends from ground G5 through the marginal relay 47, springs 76, banksprings 77 and 7 8 and the said holding winding of the line switch C tobattery B. A further result due to the energization of the relay 75 isthe preparation of a circuit for the vertical magnet 37 through thesprings 80 and 79 and opening the circuit of the release magnet 44 atthe springs 80 and 81. The apparatus is now in readiness to receiveimpulses for the first digit 2.

The operator now operates her calling device for the first digit 2,whereby the impulse springs of the calling device are'operated twicemomentarily, each time breaking the circuit of the line relay 45. Sincethe relay 75 is slow acting it does not deenergize during the momentaryinterruptions of its circuit by the relay 45, so that each time thelatter relay is deenergized, a circuit is closed extending from ground Gthrough the contacts of springs 83 and 82, springs 80 and 79, relay 85,vertical magnet 37 and the side switch wiper 39 (in first postion) tobattery 13. The vertical magnet receives two impulses over this circuitand operates to raise the switch wipers 34, 35 and 36 to a positionopposite the second level of bank contacts. The relay 85 which wasincluded in series with the vertical magnet, remains in its energizedposition during the entire time that impulses are being sent through itand. operates to close the. circuit of the private magnet 43. Thiscircuit extends from ground G through the springs 89 and 87 and the saidmagnet 43 to battery B.

'After the last impulse is delivered, the re- I magnet 38 inserieswith'the relay 85, whereby the shaft wipers are rotated onto thecontacts of the desired line. If the called line is idle, the privatemagnet 43 denergizeswhen its circuit is broken by the relay 85 after:the last impulse is delivered to the rotary magnet. The denergization ofthe private magnet allows the side switch'to advance one morepositionthat is, from second to third posltion. By the engagement of theside switch Wipers 41 and 42 with their third-position contact points,and

by the e'nergization of the bridge-cut-oii winding 90 of the line switchC, the con-- nection is completed with the called substation. The saidcircuit for the bridge cut-ofi winding extends from ground G through theside switch wiper 40 (in third position), private wiper 35, conductor 91and the winding 90 to the battery lead 100. A guarding-ground potentialis supplied to the contacts of all connector private banks which aremultipled to the called line, which prevents thecalled line from beingseized by some other connector switch. A circuit is also closed-throughthe right-hand winding of the meter M which extends over thealcove-tracedcircuit and from the conductor 91 through the right-handwinding of the 'the said polarized relay is battery lead 100. By themeter M to the battery lead 100. The meter Mwdoe's not operate at thistime, asit takes the combined strengthof both of its windings for it tooperatively energize. The

operators key K is restored to normal, thus bridging the polarized relay31 across the conductors 64 and 65, The current through to. cause thearmature 92 to, close contact with the'spring 93, thus causing lamp 30to glow.- This circuit extends from ground G through contacts 92 and 93and lamp 30 to engagement. of the side switch. wiper 39 with itsthird-position contact relay 49 closed. This circuit extends from in thedirection point, the-circuit of the ringing inserts ground G through'theinterrupter 94, re-

49, springs 95 and the side switch wiper 39 (in third position) tobatter The ringing relay, uponenergizing, isconnects' the calling linefrom the called lineand bridges the ringing current generator it acrossthe called line, The ringing relay is energized only intermittentlythrough the medium of the interrupter 94. Upon the response of thecalled subscriber his line is provided with talking current through theback-bridge relay 46. The relay 46, upon energizing, closes the circuitof the ringer cut-01f relay 96. .This circuit extends from ground Gthrough the side switch wiper 40 (in third position), springs97 and therelay 96 to battery B. The relay 96, upon energizing, breaks the circuitof the rlngin relay 49 at the springs 95 and closes a 100 ing circuitfor itself through the springs 98 independent of the springs 97. Afurther. re sult of the energization of the back-bridge" relay upontheresponse of the called subscriber is the transposition of the batteryconnection of the windings of the line relay 45 with regard to battery13, whereby the direction of current in the trunk conductors 64 and 65is reversed. The reversing of the current in the said line causes thepolarized relay 31 of the cord circuit 0 to operate its armature in theopposite direction, I thus causing the supervisory lamp 30 to ceaseglowing. The fies the operator that the'calledparty has answered. Shenow communicates with the called subscriber at the substation A a andinquires if he will receive a call from substation A and have the callcharged to his meter. Assuming that the called subscriber has agreed toreceive the call, the operator presses the key K thereby closing acircuit from battery B through the relay 47 at the connector H. Thiscircuit extends from ground G through battery B, key K sleeve of theplug P, bush of the jack J, conlamp 3O ceasing to glow noti;

'ductor 66, bank springs 78 and 77, springs 7 6 and t -he right-handWinding of the relay 4'? to ground G This circuit being of com:paratively lowv resistance suiiicient current passes through the relay47 to cause it to operatively energize. The winding 48 of the lineswitch C is maintained energized while the key K cuit extending fromground G through battery B, over the above-traced circuit to the bankspring 78, then through thewinding 48 to battery B, thence throughbattery B to ground G, the two batteries operating in series. The relayv47, upon energizing, completes a locking-circuit for itself extendingfrom ground G through the left hand windingvof said relay, contact ofsprings 102, sideswitch wiper-39 (in third position) to battery B; Afurther result of the energization of the relay 47 is the transis beingpressed over a cirof the current over the called line is reversed. Thereversing of the current over the called line causes the current in thewindings of the magnet 108 of the meter M to assist ea h other and as aconsequence the armature of said magnet is attracted and operates toregister the call upon the meter M. The magnet 103, upon energizing,also closes the contact of springs 10%, whereby the left-hand winding isshort circuited and the magnet remains held in its operated position bythe right-hand winding alone, which, although it is not strong enough tooperate the armature alone, is strong enough to hold it in its operatedposition. The subscribers may now carry on an uninterrupted conversationover the heavy conductors shown.

At this point in the operation, attention is called to the circuit foroperating the relay 47 in a system wherein the selector M is used. lVhenthe operator presses the key K this circuit extends from ground Gthrough battery B, key K, sleeve of the plug P, bushing of the jack J,conductor 66, bank springs 78 and 77, conductor 201 (Fig. r), springs202, side switch arm 203, springs 204, side switch arm 205, wiper 206,conductor 207, spring 76 (Fig. 2), and the right hand winding of therelay 47 to ground (i Relay 7 operates over this circuit the same asbefore described to accomplish the same result.

The replacing of the receivers at the called and calling substationssignals the operator that the conversation has terminated. When thereceiver at the substation A. is restored to the switch-hook, theseparation of the hook-switch spring destroys the energizing circuit ofthe line relay 54. The line relay 5%, upon denergizing, opens thecircuit of the relays 27 and 60 at the springs 61. The relay 27, upondenergizing, completes a circuit through the supervisory lamp 29. Thesaid circuit extends from ground G through the plug seat springs 28,springs 62 and the said supervisory lamp 29 to the battery lead 100. Thereplacing of the receiver at the called substation A opens the circuitof the backbridge relay 46 at the switch-hook springs 105 and 106. Thedenergization of the re lay l6 reverses the current back to normal inthe conductors 64: and 65, which causes th polarized relay 31 to attractits armature in the opposite direction, causing the supervisory lamp 30to again glow. The operator having received the disconnect signalremoves the plug P from the jack J, thereby destroying the holdingcircuit for the holding winding of the line switch C. The holdingwinding of the line switch C,

upon deenergizing, allows the plunger arm 10 to return to normalposition. The plug P returning to normal position opens the circuit ofthe supervisory lamp 29 at the springs 28. The removing of the plug Pfrom the jack J destroys the energizing circuit of the line relay 45 ofthe connector H. The relay 4:5 is thereupon deenergized and opens thecircuit of the relay 75. The relay 75, upon deenergizing closes thecircuit of the release magnet 44. This circuit extends from ground Gthrough the contact of springs 83 and 82, springs 80 and 81, ednormalsprings 107 and the release magnet 44 to battery B. The releas magnet,upon energizing, restores the switch shaft and side switch wipers tonormal position and its own circuit is broken at the springs 107 whenthe shaft reaches its lowest position. The relay 75, upon denergizing,also opens the holding circuit for the winding &8 of the line switch (1at the springs 76. The line switch G releases in the same manner asexplained in connection with the line switch C.

If the subscriber at substation A had not asked that the charges bereversed, the connection would have been the same as explained above,but the charge would have been made to the calling substation meter M inthe following manner: The operator completes the connection in the samemanner as before described; then, as soon as the called subscriberanswers, the key K is pressed, which causes the relay 26 to beoperatively energized. The said circuit eX- tends from ground G throughth battery B, key K, sleeve of the plug P, bush of the jack J, springs61 and the relay 26 to battery B, thence through battery B to ground G.The two batteries operating in series cause the relay 26 to beoperatively energized. The relay 26, upon energizing, causes thetransposition of the battery connections to the calling line, wherebythe direction of current in the calling line is reversed. The reversingof the current over the calling line causes the meter M to oper ate inthe same manner that the meterM operated at the substation A to registerthe said call.

In case a line is already busy when called, the calling subscriber isgiven a busy signal from the busy machine Q in the usual and well-knownmanner.

It will thus be seen that I have devised a very eflicient measuredservice system in which the call can be charged against either the meteron the calling line or the one on the called line. Furthermore, thismeans is operated over the private wiper, thus avoiding the necessit ofthe addition of a special wiper to any 0 the switches. While in thesystem I have illustrated I have shown certain types ofautomatictelephone switches and a certain form of cord circuit, it will,of course, be understood that I do not wish to be limited to the type'ofswitches em ployed, as my invention is equally as well adapted foruse in connection with other forms ofswitches and cord circuits.Likewise, it will be readily understood that if desired selectorswitches of any well-known type can be inserted between the line switchand the connector for the purpose of 111- creasing the capacity of thesystem. The use of such selectors being well known in the art, it is notthought necessary to further describe the manner in which they areemployed. Various other changes and modifications will readily suggestthemselves to thoseskilled in the art and come within the contemplatedscope of my invention.

What I claim asmy invention is 1. In a telephone system, a calling and acalled subscribers line, a registering device associated with saidcalled line, means including an automatic switch for establishingconnection between said lines, said switch inlease circuit includingsaid private wiper,

and means controlled by said operator over said private wiper foroperating the meter on the called line after the connection has beenestablished.

3. In a telephone system, called subscribers line, on said called line,an operators cord circuit adapted to be connected with the calling line,

a calling and a an automatic connector switch for connects ing with thecalled line, means including a trunk-selecting switch for extendingconnection from said cordcircuit to said connector, a holding circuitfor said trunk-selecting switch, and means controlled by said operatorover said holding circuit. for operating the meter on the called lineafter said connection has been established.

4. In a telephone system, a calling and a called subscribers line, aregistering device on said called line, an operators cord circuitadapted to be connected with the calling line, an automatic connectorswitch forconnecting with the called line, means including atrunk-selecting switch for extending connection from said cord circuitto said connector, a holding circuit for said trunk-sethe calling line,an switch for connecting a registering device insane cord circuitadapted tobe connected with the calling line, an automatic connectorswitch for connecting with the called line, means for extending aconnection from said cord circiiit to said connector, a relay in-saidconnector, means for closing a circuit through said relay withoutoperatlvely energizing the same when connection is established with saidconnector, means controlled by erator for increasing through said relayto same, and means controlled by the operation of said relay foroperating the registering device on the called line. Y v

6. In a telephone system, a calling and a called subscribers line, aregistering device associated with the called line, an operators cordcircuit adapted to be connected with automatic connector said opthe flowof current means for extending a connection from said cord circuit tosaid connector, a relay in said means for closing a circuit through saidrelay without operativelyenconnector,

ergizing the same when connection is established with said connector,means controlled by said operator for increasing the flow of currentthrough said relay to thereby opera ate the same, means controlled bythe opera thereby operate the with. the called line, i

tion of said relay for operating the registers a ing device on thecalled line, and a locking circuit for said relay for maintaining thesame energized until the connection is released.

7. In a telephone system, a calling and a called subscribers line, aregistering device associated with the called line, an operators cordcircuit adapted to be connected with the calling line, an automaticconnector switch for establishing connection with the called line, meansincluding a trunk-selecting switch for extending the connection fromsaid cord circuit to said connector switch, a relay in said connector,means for closing a circuit through said relay without operativelyenergizing the same when connection is established with said connector,means controlled by said operator for increasing thereby operate thesame, and means controlled by the operation of said relay for. operatingthe meter on the called line after y the flow of current through saidrelay vto cord circuit adapted to be connected with the calling line, anautomatic connector switch for establishing connection with the calledline, means including a trunk-selecting switch for extending theconnection from said cord circuit to said connector switch, a relay insaid connector, means for closing a circuit through said relay withoutoperatively energizing the same when connection is established with saidconnector, means controlled by said operator for increasing the flow ofcurrent through said relay to thereby operate the same, means controlledby the operation of said relay for operating the meter on the calledline after said connection has been established, and a locking circuitfor said relay for maintaining the same energized until the connectionis released.

9. In a telephone system, a calling and a called subscribers line, meansfor establishing connection between said lines, a relay, meanscontrolled by the establishment of said connection for closing a circuitthrough said relay without operatively energizing the same, means forincreasing the flow of current through said relay to thereby operate thesame, a registerin device for charging a connection to the cailed line,and means controlled by the operation of said relay for causing theoperation of said registering device.

10. In a telephone system, a plurality of subscribers lines, meansincluding an operators cord circuit for establishing a connectionbetween two of said lines, a relay, means controlled by theestablishment of said connection for closing a circuit through saidrelay without operatively energizing the same, means controlled by said0 erator for increasing the flow of current t irough said relay tothereby operate the same, a registering device for charging a connectionto the called line, and means controlled by the operation of said relayfor operating said registerin device. a

'11. n a telephone system, a calling and a called subscribers line, ameter associated with the called line, a meter magnet having a pair ofenergizing windings for controlling the operation of said meter, meansincluding an automatic switch for establishing a con nection betweensaid lines, said switch including a pair of line wipers and a privatewiper, a trunk-release circuit including said private wiper, means forinitially energizing the windings of said meter magnet in opposition,whereby said magnet is not operated, and means controlled over saidprivate wiper for reversing the current in one wind ing to thereby causethe operation of said meter magnet. s

12. In a telephdne system, a calling and a called subscribers line, ameter associated with the called line, a meter magnet having a pair ofenergizing windings for controlling the operation of said meter, anoperators cord circuit adapted to be connected with the calling line,means including an automatic switch for extending connection from saidcord to said called line, said switch including a pair of line wipersand a private wiper, a trunk-release circuit including said privatewiper, means for initially energizing the windings of said meter magnetin opposition, whereby said magnet is not operated, and means controlledby said operator over said private wiper for reversing the current inone winding to thereby cause the operation of said meter magnet.

13. In a telephone system, a calling and a called subscribers line, aregistering device on said called line, an operating magnet thereforhaving a pair of energizing windings, an operators cord circuit adaptedto be connected with the calling line, an automatic connector switch forconnecting with the called line, means including a trunk-se-- lectingswitch for extending connection from said cord circuit to saidconnector, a holding circuit for said trunk-selecting switch, means forinitially energizing the windings of said register operating magnet inopposition, and means controlled by said operator over said holdingcircuit for reversing the current in one winding of said magnet tothereby cause the operation of said registering device.

1a. In a telephone system, a callin and a called subscribers line, aregistering device associated with the called line, an operating magnettherefor having a pair of energizing windings, an operators cord circuitadapted to be connected with the calling line, an automatic connectorswitch for connecting with the called line, means for extendingconnection from said cord circuit to said connector, means for initiallyenergizing the windings of said magnet in opposition, a relay in saidconnector, means for closing a circuit through said relay withoutoperatively energizing the same when connection is established with saidconnector, means controlled by said operator for increasing the flow ofcurrent through said relay to thereby operate the same, and meanscontrolled by the operation of said relay for reversing the current inone winding of said magnet to thereby cause the operation of saidregistering device.

15. In a telephone system, a calling and a called subscribers line, aregistering device associated with the called line, an operating magnettherefor having a pair of energizing windings, an operators cord circuitadapted to be connected wth the calling line, an automati connectorswitch for connecting with the called line, means for extendingconnection from said cord circuit to said connector, means for initiallyenergizing the windings of said magnet in opposition, a

relay in said connector, means for closing a circuit through said relaywithout operatively energizin the same when connection is establishedwit said connector,-means controlled by said operator for increasin theflow of current through said relay to t ereby operate the same, meanscontrolled by the operation of said relay for reversing the current inone winding of said magnet to thereby cause the operation of saidregistering device, and a locking circuitfor said relay for maintainingthe same energized until the connection is released.

16. In itelephone system, a calling and a called subscribers line, meansfor establishing connection betweensaid lines, a relay, me ns controlledby the establishment of i said connection for closing a circuit throughsaid relay WltllOLlt operatively energizing the same, means forincreasing the flow of current through said relay, to thereby operatethe same, aregistering device, an operating magnet therefor havinga pairof en ergizin windings, means forinitially energizing said windings inopposition, whereby 7 said magnet is not operated, and means controlledb the operation of said relay forreversing the currentin one winding tothereby cause the operation of said registering device.

17. In a telephone system, alplurality of subscribers? lines, meansincluding an operators cord circuit for establishing connection betweentwo of said lines, a relay, a registering device, an operating magnettherefor having a pair of energizing windings, means controlled by theestablishment of said connection for closing a circuit through saidrelay without operatively energizing the same and for closing a circuitthrough the windings of said magnet in 0p 7 7 position, whereby saidmagnet is not operated, means controlled by said operator for increasinthe flow of current through said relay to t ereby operate the same, andmeans controlled by the operation of said relay for reversing thecurrent in one winding of said magnet to thereby cause the operation ofsaid registering device. v

18. In a telephone system, a plurality of subscribers lines, meansincluding an operators cord circuit for establishing connec tion betweentwo of said lines, a registering device, an operating magnet thereforhaving a pair of energizing windings, means for initially energizingsaid windings in opposition, whereby said magnet is not operated,

and means controlled by said operator by an increased flow of currentfor reversing the current in one winding of said'magnet to thereby causethe operation of said registering device.

19. In a telephone system, a plurality of subscribers lines, meansincluding an operators cord circuit for establishing connection betweentwo of said lines, said cord circontacts and a t ir each link. 7 v p 23.In a telephone system, a calling line, a called line, a

cuit including a 111 having a pair of line normally contact,a plug seat.switch, a relay connected to said third conrelay and across the calledend of said cord, and a second supervisory signal controlled by gridpolarized relay, a meter, and means for an ergizing said meteroversaidthird contact.

20. In a telephone system, a calling line, a called line, a manual cordcircuit link: and an automatic progressively movable switch 7 link forconnecting the. two lines, a meter for charging the call to the calledline, and a section individual to j each '21. i a called line, a manualcord circuit link and an automatic link for connecting the two lines .-ameter individual controlling circuit for said, meter havinga individual-t0 eachy link. If

a called line, a I y I an automatic progressively movable switch In atelephone system, a calling line,

progressively movable switch 7 to'thefcalled line, 'and'a controllingcircuit for said-meter having a section" link for connecting the twolines, .a'meter for chargi the call controlling circuit sectionindividual to to the calledalinau and a manual cord circuit link and forsaid meterfhavinga the called i line 1 and-to an automatic progressivelymovable switch" link for connecting the two lines, a incterin-.-:-

dividual to the called individual to link.

.24. Ina telephone system, a called line, an automatic link forconnecting the two lines, saidlihks line, and a controlicj' lingGlI'CllltfO-D said meter' havinga section the called line and to 'each'l a ca 111 6;"

a manualcord circult link. and; progressively movable switch lintnormally disconnected, a meter for charging--- the call to the calledline and a controlling circuit for said meter having a section dividualto each link.

25. In a telephone trunking system, a calling line, a called line, aplurality of link circuits forconnecting the two, a meter for chargingthe call to the called line, a controlling circuit for said meter havinga section individual to each link, a guarding potential circuit for oneof said links for mak- 26. In a telephone trunking "system, a calling.line a called line, a plurality of link circuits for connecting the two,a meter inual to each link, a guarding potentialcircuit izo ing it busywhilethe two lines are'connected, said guarding circuit and saidcontrolling clrcult using a conductor 111 common;

' dividual to the called line, a controlling cir- 'cuit for said meterhaving a section individ- I anaemic tor one of said links for making itbusy while the two lines are connected, said guarding circuit and saidcontrolling on curt a conductor in common.

in a telephone trunhng system, a calling line, a called line a pluralityof link circuits for connecting t e two, a meter for charging the callto the called line, a controllin circuit for said meter having a sectionin 'vidual to thecalled line and to each link, a guarding potentialcircuit for one of said links for making it busy while the two lines areconnected, said guarding circuit and said controlling circuit using aconductor in common.

28. in a telephone trunking system, a calling line, a called line, aplurality of link circuits for connecting the two, a meter individual tothecalled line, a controlling circuit for said meter having a sectionindividnal to the called line and to each link, a guarding potentialcircuit for one of said links for making it busy while thetwo lines areconnected, said guarding circuit and said controlling circuit using aconductor in common.

29. in a telephone trunking system, a calling line, a called line, aplurality of talking conductor links for connecting the two, a meter forcharging the call to the called line and a controlling circuit for saidmeter having a section individual to each link, a ardlng potentialcircuit for one of said 1' for making it busy while the two lines areconnected, said guarding circuit and said controlling circuit using aconductor in common.

30. In a telephone trunking system, a calling line, a called line, apluralityof disconnected talking conductor links for connecting the two,a meter for char g the call to the called line and a control 'ng circuitfor said meter having a sectionindividual to each link, a ardingpotential circuit for one of said links for making it busy while the twolines are connected, said guarding circuit and said'controlling circuitusing a conductor in common.

31. in a tele hone trunking system, a calling line, a ca ed line, aplurality of normally disconnected talhng conductor for connecting thetwo, a meter for char ing the call to the called line and a contro. l' acircuit forvsaid meter having a section individual to each link aguarding potential circuit for one of said links for making it husywhile the two lines are connected, said guarding circuit and saidcontrolling circuit using a conductor in common 32. in a telephonetrunhng system, a 1 line, a called line, a plurality of normallydisconnected connec 1 the two, a meter individual to the a line and acontrolling circuit for said meter ..=.."o. a section individual to thea meter individual to the called line and a controlling circuit for saidmeter having a section individual to the called line and to each link, aguarding potential circuit for one of said links for making it busywhile the two lines are connected, said guarding 30 circuit and saidcontrolling circuit using a conductor in common.

ln a telephone trunking system, a calling line, a called line, aplurality of talking conductor links for connecting the 35 two, a meterfor char 'ng the call to the called line and a controing circuit forsaid meter havin a section individual to each link, a ar mg 'otentialcircuit for one of said lin lines are connected, said guarding circuitand said controlling circuit using a conductor in common, said uardingcircuit being separate from the tal in conductors.

35. In a teleplione tru ing line, a called line, a plurality ofdisconnected talking conductor linksfor connecting the two, a meter forchar g the call to the called line and a controfiiiig cirfor ma g itbusy while the two 91} a system, a call- 95 cuit for said meter having asection individual to each link, a guarding potential circuit for one ofsaid links for making it busy while the two linesare connected saidguarding circuit and said controlling circuit using a conductor incommon, said guarding circuit being separate from the talkingconductors.

36. In a telephone trunking system, a calling line, a called line, aplurality of normally disconnected talking conductor links forconnecting the two, a meter ior char 'ng the call to the called line anda control ing circuit for said meter having a section lndk' vidu al toeach link a guarding potential circuit for one of said links for makingit busy while the two lines are connected, said guarding circuit andsaid controlling circuit using a conductor in common, said guardingcircuit being separate from the talking conductors. V

37. In a telephone system, a callin line a called line, a manual cordcircuit an an automatic progressively movable switch link for connectingthe two lines, a meter for charging the call to the called line, acontrolling ircuit for said meter having a section individual to eachlink, and a circuit controller for said control circuit at the cordwhereby the operator may operate the meter over the control circuit.

- tion in link and o circult controller for semi con 9. called line,

7 38.111 a telephone system, c cellinc line 9, celled line, a menuelcord circuit not: en an outcmoticprogressively movelole switch link forconnecting the two linee, e meter individual to the celled line econtrollin, circuit for said meter having c, section ind1- vidual toeach link, and e circuit controller for said control circuit "at thecord whereby the operator may operate the meter over the controlcircuit.

39. In e telephone system, c cellino' line, a coiled line, o monuclcord. circuitelirilr and en automaticprogressively movable switch linkfor connecting the two lines, o meter tor charging the cell to thecellerl lineQe conil'Olllllfi circuit for said meter hering e eecividuol to the called line end to etch trol circuitet the cord Wherebfirthe operator may operete the meter over t e controlcircuit V 40. In ittelephone system, c cellino line, 21 called line, it mcnuel cord circuitii and an automatic orogressivelymovehle switch link for connecting thetwo lines, a meter individual to the called line, a controlling circuitfor said meter vicluel to the called. line and. toicech link,

and a circuit controller for scicl'cnntrol cire cuit at the cord wherebythe operator may operate the meter over the control circuit.

1 41. In a telephone system, e calling line, it manual cord circuit linkend an automatic progressively movable switch link for connecting thetwo lines, seicl links normally disconnected, e meter for charginghaving c section indiweenie the cell to the celled line and o controllincircuit for said meter hoving e eection indie viciuel to each link, ande circuit controller for said control circuit et the cord whereby theoperator rnoy operetethe meter over the control circuit. 7

42, In a; telephone system, a line, a. seconi line, o plurality oftrunks terminating cech in on automatic progressively movable switch,eech trunk enclcorreeponding switch constituting a link, said linehcvingaccess to eny one of said; links, a plurality of other trunksterminating each in en eutonietic progressively movable connectiveswitch,

each one of said other trunks and its cor res ending connective switchconstituting a lin c, any trunkin switch having access to any one ofsaid oti or links, o meter for'the second line, energizing circuits forsaid meindividuel to the second line and a branch in each of said secondlinks, circuits for controlling the energizing circuits, the con-,

ter, seicl energizing circuits having a section V

